High Water Pressure Is the Quiet Plumbing Problem That Floods Houses

Most homeowners don't think about water pressure until something bursts. We do, because we see the aftermath. High pressure is the kind of problem that sits in your house for years without making a sound, and then one weekend it turns into a flood. We check it on every service call for a reason.

What "high" actually means

Plumbing fixtures and supply lines are designed to handle around 60 to 80 PSI. Some cities in our area push water into homes at 100 PSI or more. When that pressure stays high day after day, it stresses every threaded joint, every supply line, every washing machine hose, and every toilet fill valve. None of those parts are rated for that kind of constant load. Eventually something gives.

The frustrating part is that you don't feel it. Your shower might be a little more powerful, but high pressure doesn't show up in a way that makes you call. It just chews on your plumbing slowly until a single weak spot lets go.

What a regulator does

A pressure regulator (also called a PRV, or pressure reducing valve) sits on the water line where it enters your house. It steps the city pressure down to something safe for the plumbing inside. Most homes in our service area have one. The catch is that regulators wear out, and when they fail they usually fail open, which means full city pressure starts coming back into your house.

If your regulator is more than 10 to 15 years old, it's worth checking. The test is simple. We put a gauge on a hose bib, read what's actually coming through, and tell you whether your regulator is doing its job. If it's reading 90 or 100 PSI on a system that should be at 60, the regulator is past it and needs to be replaced.

A story we tell people who hesitate

We had a customer where we checked the pressure on a routine service call and it was high. We recommended replacing the regulator, and he held off. Honestly we get it. Regulators aren't cheap, and it doesn't feel urgent.

A week later we got the call. A supply line to the upstairs master toilet had burst while the family was at the movies. A neighbor called to say there was a small river coming out the front door. That one burst supply line caused over $150,000 in damage. Drywall, paint, furniture, new cabinetry in the kitchen, the whole house flooded top to bottom.

We don't tell that story to scare anyone. We tell it because the cost of a new regulator was a tiny fraction of what that one weekend cost. High pressure is the kind of quiet problem that turns into the biggest claim of your life.

Where we see it most

Older parts of Upland, Ontario, and Fontana tend to get the highest readings, because the original pressure setups were sized for fewer homes. As more got built, the line pressure went up, and a regulator that was fine in 1985 is now fighting a fight it can't win. We also see high pressure a lot in any home with a long driveway or a hilly lot, where the elevation drop between the city main and the house adds pressure on top of what's already there.

If you're in a 1950s through 1970s home and you've never had your pressure checked, that's the single best preventive thing you can do this year.

What replacement looks like

Replacing a regulator is a same-day job in most cases. We shut the water off at the main, swap the regulator, set it to the right pressure, and turn the water back on. Once it's in, we put the gauge back on and confirm the new regulator is holding the pressure where it should be. The whole thing usually takes a couple of hours.

After that, your supply lines, your washing machine hoses, your toilet fill valves, and every other rated part of your plumbing is back inside the range it was designed for. That's it. No more quiet damage.

When to call us

Call us if any of this sounds familiar. Your faucets feel like they're really blasting. You've replaced toilet fill valves or washing machine hoses more than once in the last few years. You have a banging sound in the walls when a fixture shuts off (water hammer is often a high-pressure symptom). Or you've been in your home more than 10 years and you've never had the pressure checked.

We carry pressure gauges on every truck and the check itself takes about five minutes. We'd rather find this for you on a quiet Tuesday than meet you after a Friday-night flood.

FAQ

What is normal water pressure for a home?

Most residential plumbing is designed for 60 to 80 PSI. Anything above 80 is considered high and starts shortening the life of every component on your system. Anything above 100 is hard on the plumbing every day it's running.

How do I know if my water pressure is too high?

The most reliable check is a pressure gauge on an exterior hose bib. If you don't have one, signs include banging in the walls when a faucet or toilet shuts off, hoses or supply lines that fail repeatedly, toilet fill valves that wear out fast, or a shower that feels overpowered. If any of those sound like your house, we can put a gauge on it and tell you in five minutes.

Where is my pressure regulator located?

Usually on the main water line where it enters the house, often near the front faucet or in a small box near the garage or front yard. If you can't find it, you may not have one (some older homes were built without one). We can locate it on a service call.

How long does a pressure regulator last?

Most regulators last 10 to 15 years. After that they tend to drift out of calibration or fail entirely. If yours is older than that and has never been serviced or replaced, it's past due for a check.

Will high water pressure make my water bill higher?

Yes. Higher pressure means more water goes through your fixtures per second of use, so a shower or a faucet uses more without you noticing. Fixing the pressure typically nudges the bill down a small amount each month.

Can I replace a pressure regulator myself?

We don't recommend it. The unit has to be sized correctly for your incoming pressure and the connections have to be made cleanly with the right transition fittings. A regulator that's installed wrong leaks, and a regulator that's set wrong creates the exact problem you're trying to fix.